Those would have been made prior to 13 September 1994.
If the model was named under the old law, whether or not the preban exemption applies is something that many people here debated, that CSP has a position on, and that various sellers have a position on. Some, like myself, tend to be cautious and choose not to get involved. (I don't encourage anybody to buy or possess one) Others enjoy them. I'm sure that you can find some of the past threads on that topic.